net: mvpp2: RSS indirection table support

This patch adds the RSS indirection table support, allowing to use the
ethtool -x and -X options to dump and set this table.
Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
[Maxime: Small warning fixes, use one table per port]
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2/mvpp2.h

@@ -801,6 +801,9 @@ struct mvpp2_port {
 	bool has_tx_irqs;
 
 	u32 tx_time_coal;
+
+	/* RSS indirection table */
+	u32 indir[MVPP22_RSS_TABLE_ENTRIES];
 };
 
 /* The mvpp2_tx_desc and mvpp2_rx_desc structures describe the

drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c

@@ -107,6 +107,20 @@ void mvpp2_cls_oversize_rxq_set(struct mvpp2_port *port)
 	mvpp2_write(port->priv, MVPP2_CLS_SWFWD_PCTRL_REG, val);
 }
 
+void mvpp22_rss_fill_table(struct mvpp2_port *port, u32 table)
+{
+	struct mvpp2 *priv = port->priv;
+	int i;
+
+	for (i = 0; i < MVPP22_RSS_TABLE_ENTRIES; i++) {
+		u32 sel = MVPP22_RSS_INDEX_TABLE(table) |
+			  MVPP22_RSS_INDEX_TABLE_ENTRY(i);
+		mvpp2_write(priv, MVPP22_RSS_INDEX, sel);
+
+		mvpp2_write(priv, MVPP22_RSS_TABLE_ENTRY, port->indir[i]);
+	}
+}
+
 void mvpp22_init_rss(struct mvpp2_port *port)
 {
 	struct mvpp2 *priv = port->priv;
@@ -129,12 +143,8 @@ void mvpp22_init_rss(struct mvpp2_port *port)
 	/* Configure the first table to evenly distribute the packets across
 	 * real Rx Queues. The table entries map a hash to a port Rx Queue.
 	 */
-	for (i = 0; i < MVPP22_RSS_TABLE_ENTRIES; i++) {
-		u32 sel = MVPP22_RSS_INDEX_TABLE(port->id) |
-			  MVPP22_RSS_INDEX_TABLE_ENTRY(i);
-		mvpp2_write(priv, MVPP22_RSS_INDEX, sel);
-
-		mvpp2_write(priv, MVPP22_RSS_TABLE_ENTRY, i % port->nrxqs);
-	}
+	for (i = 0; i < MVPP22_RSS_TABLE_ENTRIES; i++)
+		port->indir[i] = ethtool_rxfh_indir_default(i, port->nrxqs);
 
+	mvpp22_rss_fill_table(port, port->id);
 }

drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h

@@ -32,6 +32,8 @@ struct mvpp2_cls_lookup_entry {
 	u32 data;
 };
 
+void mvpp22_rss_fill_table(struct mvpp2_port *port, u32 table);
+
 void mvpp22_init_rss(struct mvpp2_port *port);
 
 void mvpp2_cls_init(struct mvpp2 *priv);

drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c

@@ -3821,6 +3821,71 @@ static int mvpp2_ethtool_set_link_ksettings(struct net_device *dev,
 	return phylink_ethtool_ksettings_set(port->phylink, cmd);
 }
 
+static int mvpp2_ethtool_get_rxnfc(struct net_device *dev,
+				   struct ethtool_rxnfc *info, u32 *rules)
+{
+	struct mvpp2_port *port = netdev_priv(dev);
+
+	if (!mvpp22_rss_is_supported())
+		return -EOPNOTSUPP;
+
+	switch (info->cmd) {
+	case ETHTOOL_GRXRINGS:
+		info->data = port->nrxqs;
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	return 0;
+}
+
+static u32 mvpp2_ethtool_get_rxfh_indir_size(struct net_device *dev)
+{
+	return mvpp22_rss_is_supported() ? MVPP22_RSS_TABLE_ENTRIES : 0;
+}
+
+static int mvpp2_ethtool_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
+				  u8 *hfunc)
+{
+	struct mvpp2_port *port = netdev_priv(dev);
+
+	if (!mvpp22_rss_is_supported())
+		return -EOPNOTSUPP;
+
+	if (indir)
+		memcpy(indir, port->indir,
+		       ARRAY_SIZE(port->indir) * sizeof(port->indir[0]));
+
+	if (hfunc)
+		*hfunc = ETH_RSS_HASH_CRC32;
+
+	return 0;
+}
+
+static int mvpp2_ethtool_set_rxfh(struct net_device *dev, const u32 *indir,
+				  const u8 *key, const u8 hfunc)
+{
+	struct mvpp2_port *port = netdev_priv(dev);
+
+	if (!mvpp22_rss_is_supported())
+		return -EOPNOTSUPP;
+
+	if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_CRC32)
+		return -EOPNOTSUPP;
+
+	if (key)
+		return -EOPNOTSUPP;
+
+	if (indir) {
+		memcpy(port->indir, indir,
+		       ARRAY_SIZE(port->indir) * sizeof(port->indir[0]));
+		mvpp22_rss_fill_table(port, port->id);
+	}
+
+	return 0;
+}
+
 /* Device ops */
 
 static const struct net_device_ops mvpp2_netdev_ops = {
@@ -3852,6 +3917,11 @@ static const struct ethtool_ops mvpp2_eth_tool_ops = {
 	.set_pauseparam		= mvpp2_ethtool_set_pause_param,
 	.get_link_ksettings	= mvpp2_ethtool_get_link_ksettings,
 	.set_link_ksettings	= mvpp2_ethtool_set_link_ksettings,
+	.get_rxnfc		= mvpp2_ethtool_get_rxnfc,
+	.get_rxfh_indir_size	= mvpp2_ethtool_get_rxfh_indir_size,
+	.get_rxfh		= mvpp2_ethtool_get_rxfh,
+	.set_rxfh		= mvpp2_ethtool_set_rxfh,
+
 };
 
 /* Used for PPv2.1, or PPv2.2 with the old Device Tree binding that